a
The expression for constant pressure process is,
$\frac{W}{Q}=\frac{n R \Delta T}{n C_{p} \Delta T}$
$=\frac{n R \Delta T}{n\left(\frac{f}{2}+1\right) R \Delta T}$
$=\frac{1}{\frac{f}{2}+1}$ $........(I)$
Substitute $5$ for $f$ in equation $(I).$
$\frac{W}{Q}=\frac{1}{\frac{5}{2}+1}$
$=\frac{2}{7}$
$Q=\frac{7}{2} W$ $...(II)$
Substitute $10$ for $W$ in equation $(II).$
$Q=\frac{7}{2}(10)$
$=35 J$